30 terms

the atomic number shows the ...

number of protons

the mass number shows the...

number of protons and neutrons

the average atomic mass is the...

weighted average of all the naturally occurring isotopes

isotope

atoms of the same element having different masses due to different numbers of neutrons

nuclides

refers to the nucleus of an atom which includes protons and neutrons

ion

an atom or group of atoms that have a positive or negative charge

anion

negative charge

cation

positive charge

electrons

have a -1 charge, 0 (mass number) and a very low amu number

proton

have a +1 charge, 1 (mass number), and 1.007276 amu number

neutron

have a 0 charge, 1 (mass number), and 1.008665 amu number

protium (H-1)

has 1 proton, 0 neutrons, and 99.985% abundance

deuterium (H-2)

has 1 proton, 0 neutrons, and 0.015% abundance

tritium (H-3)

has 1 proton, 2 neutrons, and a trace amount

62 neutrons and 48 protons

How many protons and neutrons in Cd-110?

15 protons, 19 neutrons, and 18 electrons

How many protons, neutrons, and electrons

in P P(-3)-34?

in P P(-3)-34?

51 protons, 71 neutrons, and 46 electrons

How many protons, neutrons, and electrons

in Sb+5-122?

in Sb+5-122?

mole (mol)

the measure of the amount of substance

6.02 x 10^23

what is the mole/Avogadro's number? (the number written in scientific notation)

atomic mass unit (amu)

a unit of mass equal to one-twelfth the mass of a carbon 12 atom

!!!!!!!!! know this

know this!

divide by the molar mass

to convert mass to moles, you...

multiply by the molar mass

to convert moles to mass you...

multiply by 22.4 L

to convert moles to volume you...

divide by 22.4 L

to convert volume to moles you...

multiply by 6.02 x 10^23

to convert moles to atoms, particles, molecules you...

divide by 6.02 x 10^23

to convert atoms, particles, and molecules to moles you...

1(.992) + 2(0.008) = 0.992 + 0.016 = 1.008 amu

Hydrogen consists of three isotopes:

protium (H-1), deuterium (H-2 ), and tritium (H-3).

Calculate the average atomic mass of hydrogen if the relative abundance of H-1 is 99.2 %, H-2 is 0.8%, with only trace amounts of H-3.

protium (H-1), deuterium (H-2 ), and tritium (H-3).

Calculate the average atomic mass of hydrogen if the relative abundance of H-1 is 99.2 %, H-2 is 0.8%, with only trace amounts of H-3.

69.72 = .64(69) + .36(x)

69.72 = 44.16 + .36x

=71 amu

69.72 = 44.16 + .36x

=71 amu

There are two isotopes of gallium. If the average atomic mass of gallium is 69.72 amu and the relative abundance of Ga-69 is 64%, calculate the mass number of the second isotope of Ga.

.246(202) + 209 (.754) =

= 157. 586 + 49.692

= 207.278 amu

= 157. 586 + 49.692

= 207.278 amu

There are two isotopes of lead. Pb-202 having a relative abundance of 24.6% and Pb-209. Calculate the average atomic mass of Pb.